<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.0/dist/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous" />
    <link rel="stylesheet" href="3.css" />
  </head>
  <body>
    <div class="container mt-5">
      <div class="card">
        <div class="card-header">Header</div>
        <div class="card-body">
          <h4 class="card-title">Title</h4>
          <p class="card-text">Text</p>
        </div>
        <div class="card-footer text-muted">Footer</div>
      </div>
    </div>
  </body>
</html>
